891469440 has 96 divisors (see below), whose sum is σ = 3078375300. Its totient is φ = 237723648.

The previous prime is 891469427. The next prime is 891469441. The reversal of 891469440 is 44964198.

It can be written as a sum of positive squares in 2 ways, for example, as 870014016 + 21455424 = 29496^2 + 4632^2 .

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (891469441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71625 + ... + 83144.

Almost surely, 2^891469440 is an apocalyptic number.

891469440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

891469440 is an abundant number, since it is smaller than the sum of its proper divisors (2186905860).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

891469440 is a wasteful number, since it uses less digits than its factorization.

891469440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154794 (or 154779 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 891469440 is about 29857.4854935911. The cubic root of 891469440 is about 962.4292642681.

The spelling of 891469440 in words is "eight hundred ninety-one million, four hundred sixty-nine thousand, four hundred forty".